HTC One M8 stuck in boot loop, won't power off

[wamjamslam]

Hey, so I was messing around with my phone and using TWRP, I deleted the original ROM and then, having forgotten that I'd deleted the ROM, tried to reboot the phone. My phone is now stuck on the HTC splash screen (which at the bottom has the text "This build is for development purposes only...") and won't turn off, despite me holding the power button for probably 1+ minutes. I'm planning to wait until the battery dies, then once I can boot again try to get into TWRP by holding the power button and volume down. Does anyone know if there's a way I can get to TWRP without having to wait until the battery dies (my phone is at full charge), or whether this will not work and I should try something else?

Thanks in advance!

 

[ckpv5]

Press and hold power & volume up buttons until the screen turn black then release both buttons and quickly press & hold volume down button only. This will get you to hboot

 

[wamjamslam]

Press and hold power & volume up buttons until the screen turn black then release both buttons and quickly press & hold volume down button only. This will get you to hboot

Thanks this worked!